Thanks all for replying!! ...

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Thanks all for replying!!

We have equalization tank with the size of 1200 x 2390 x 370 mm. The size of our SBR tank is 1828 x 2133 x1500 mm.

The pH in our equalization tank is good which is around 7-7.5. But the value increases after wastewater enters the SBR tank. At first we thought it somehow mixed up with pollutants that's why we wasted our sludge in SBR tank. After the wasting we managed to bring the pH down to 7.5-7.7, but the value increased after 2 days.

The foam is white stable billowing foam. 

We don't use new chemical so I have ruled out the possibility of change in wastewater composition.

What we are doing now is try to increase the retention time and usage of microorganism solution.

I will keep you guys updated.

Again, thanks all, I really appreciate your help.